/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.util.ntlm;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import cgl.narada.util.Base64;

/**
 * Parses a NTLM Type 2 Message response from the server containing the nonce
 * value.
 *
 * @author  John Yin
 */

public class NTLMType2Message extends NTLMMessage {

    byte[] m_nonce = new byte[8];

    /**
     * -----------------------------------------------------------------
     */
    public byte[] getNonce() {
        return m_nonce;
    }

    /**
     * -----------------------------------------------------------------
     */
    public void parseBase64(String b64msg) throws IOException {
        byte[] message = Base64.decode(b64msg);
        parse(message);
    }

    /**
     * -----------------------------------------------------------------
     */
    public void parse(byte[] message) throws IOException {
        ByteArrayInputStream stream = new ByteArrayInputStream(message);

        // Read NTLM Header.
        byte[] buffer = new byte[500];
        stream.read(buffer,0,8);

        // Read Type
        byte type = (byte)stream.read();

        // Read 7 0's
        stream.read(buffer,0,7);

        // Read message size.  Always 0x28.
        byte lb = (byte)stream.read();
        byte hb = (byte)stream.read();
        short msgSize = (short)(hb << 1 | lb);

        // Read 2 0's
        stream.read(buffer,0,2);

        // Read flag 0x8201...according to web page.  Net Capture = 0x8207
        stream.read(buffer,0,2);

        // Read 2 0's
        stream.read(buffer,0,2);

        // Read 8 byte nonce
        stream.read(m_nonce,0,8);

        // Read 8 0's.
        stream.read(buffer,0,8);
    }
}
